skeptic

Definitions

A person inclined to question or doubt all accepted opinions.

A person who maintains a doubting attitude toward values, plans, or statements.

Examples

He remained a skeptic until he saw the evidence with his own eyes.

The skeptic questioned the validity of the new scientific study.

Synonyms

doubter cynic disbeliever questioner pessimist agnostic incredulous person

Antonyms

believer optimist trustee idealist gullible person follower devotee